Heating Substrate With Vaporizable Medium For Uniform Temperature
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Solution Overview
Problem
Heat-not-burn aerosol generation devices face inefficiencies due to temperature uniformity issues in heating devices, leading to uneven heating of atomizable media and reduced atomization efficiency, especially with large temperature differences across the heating device.
Innovation Solution
A heating device with a heating substrate featuring closed cavities filled with a vaporizable medium, such as dowtherm or mercury, and a porous structure, which facilitates high thermal conductivity and isothermality through vapor-liquid phase change heat transfer, minimizing thermal resistance and maintaining uniform temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a conventional heating device is used, then heating function is provided, but temperature uniformity deteriorates with large temperature differences across the heating device
Solution Approach 1:
The patent introduces a vaporizable medium that undergoes phase transition between liquid and vapor states within closed cavities of the heating substrate. This phase change process absorbs and releases latent heat, enabling efficient thermal energy transfer and distribution throughout the heating device, thereby maintaining uniform temperature and reducing thermal resistance.
Solution Approach 2:
The patent utilizes the vaporizable medium in liquid and vapor phases to create a thermal convection system within the closed cavities. The circulation of the medium between liquid and vapor states creates hydraulic-like thermal flow that distributes heat uniformly across the heating substrate, solving the temperature uniformity problem.
2Productivity
If heating temperature is increased to improve atomization efficiency, then atomization performance improves, but temperature difference across the heating device increases
Solution Approach 1:
The vaporizable medium's phase transition capability allows the heating device to operate at higher temperatures for improved atomization efficiency while the phase change process itself acts as a thermal equalization mechanism. The latent heat absorption during vaporization and release during condensation prevents excessive temperature differences even at elevated operating temperatures.
Solution Approach 2:
The vaporizable medium serves as a thermal intermediary between the heating elements and the atomizable material. It absorbs heat from the heating elements through phase transition and distributes it uniformly, mediating the thermal transfer process to prevent localized overheating and maintain temperature uniformity across the entire heating surface.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures extremely high thermal conductivity and excellent isothermality, maintaining a temperature difference of less than 1°C over a 30 cm length, thereby ensuring uniform heating and enhancing atomization efficiency.
Implementation Method 1
vapor-liquid phase change heat transfer
Implementation Method 2
high thermal conductivity
Data Source
AI summary
A heating device for heating an atomizable medium includes: a heating substrate, at least one closed cavity being formed in the heating substrate; and a vaporizable medium arranged in the at least one closed cavity. In an embodiment, the at least one closed cavity includes a vacuum cavity. In an embodiment, the vaporizable medium is at least one of dowtherm, mercury, cesium, or sulfur.